A prominent Washington lobbyist who has worked for every Republican president since Richard Nixon has been tapped by the McCain campaign to conduct a study in preparation for the presidential transition, should John McCain win the election, according to sources familiar with the process.

William E. Timmons, Sr. is a Washington institution, having worked in the Nixon and Ford administrations as an aide for congressional relations, and assisted the transition teams of both Ronald Reagan in 1980 and George W. Bush in 2000. He was also a senior adviser to both Vice President George Bush in 1988 and Senator Bob Dole in 1996.

Timmons is the chairman-emeritus of Timmons and Company, a small but influential lobbying firm he founded in 1975, shortly after leaving the White House. According to Senate records, he registered to lobby in 2008 for a wide range of companies and trade groups, including the American Petroleum Institute, the American Medical Association, Chrysler, Freddie Mac, Visa USA, and Anheuser-Busch.